Tetromino
The five 4-Polyominoes, known as Straight, L-, T-,Square, and Skew.
References
Gardner, M. ``Polyominoes.'' Ch. 13 in The Scientific American Book of Mathematical Puzzles & Diversions. New York: Simon and Schuster, pp. 124-140, 1959. Hunter, J. A. H. and Madachy, J. S. Mathematical Diversions. New York: Dover, pp. 80-81, 1975.
- Nonaveraging Sequence
- Noncentral Distribution
- Noncommutative Group
- Nonconformal Mapping
- Nonconstructive Proof
- Noncototient
- Noncylindrical Ruled Surface
- Nondecreasing Function
- Nondividing Set
- Nonessential Singularity
- Non-Euclidean Geometry
- Nonillion
- Nonincreasing Function
- Nonlinear Least Squares Fitting
- Nonnegative
- Nonnegative Integer
- Nonnegative Partial Sum
- Nonorientable Surface
- Nonpositive
- Nonsquarefree
- Nonstandard Analysis
- Nontotient
- Nonwandering
- Nonzero
- Nordstrand's Weird Surface